Controllable battery pack

FIG. 1 is a right rear perspective view of a controllable battery pack showing my new design, as installed on a bicycle;

FIG. 2 is a similar view on a much larger scale thereof;

FIG. 3 is a left side elevational view thereof, the right side being a mirror image of the left side;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a rear elevational view thereof.

The broken line showing of the bicycle in FIG. 1 is included for the purpose of illustrating environmental structure only and forms no part of the claimed design.